Question about Cars & Trucks

2 Answers

Question for jack layton. If I have power coming from the relay but it's not getting to the pump, where does it go between? I mean does it go from the relay to the body control module then the pump?

Usually a PCM just makes the grounds, I don't know if the BCM does the same or what? If I ran power to the pump wire and or made the ground good, would it cause a problem elsewhere? I've been wrenching for 40 years but when they started adding PCM's BCM's, TCM's....it's not as easy as just running a fresh piece of wire from the fuse to the part like it used to be. It's kind of overwhelming how many wires are in a harness anymore, searching for a little cut, pinch or melt can be impossible unless you take the whole car apart! LOL So, anyway, if you can help me on that, I'd appreciate it, I'm not sure what will happen if I just make the ground or run power to it. I don't want to fry the BCM or anything. Thanks, Wayne

Posted by on

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 12,195 Answers

GM Fuel Pump Relay Testing Fuel Pump Electrical Circuits Description and Operation
If your missing B+ voltage somewhere , you have high resistance in the circuit ! Do you know how to do voltage drop testing to find high resistance ? If you been wrenchen for 40 years this is something you should know ! Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Posted on Dec 08, 2016

Testimonial: "Agreed, I should. 40 years ago I was 10, mom was coming home from work and I could hear the back brakes grinding. She asked, "can you fix that?" I said, "do I have a choice". LOL So I STARTED wrenching 40 years ago I should have said. I've been doing it on and off since I was a kid but mostly parts changing. Thanks for the vids and info, VERY helpful. Wayne"

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Cars & Trucks Master
  • 3,657 Answers

Hi Wayne, I'm sure your a better mechanic than I, I just looked at your wiring diagram. The control side of relay, that little coil looking sign, it needs voltage and ground, the ground appears to be chassis ground, the voltage comes from pcm. The load side of relay is that line with arrow-head, when relay is energized, that arrow-head moves to other terminal and carries voltage to pump motor. If you use a proper jumper wire on the two terminals, load side of relay, one of those terminals should be hot, if wiring and pump motor are ok, the pump should run. Your bypassing the control side of relay by using jumper.

Posted on Dec 08, 2016

Testimonial: "Ok, it turns out the relay is not activating. If the G6 connection is ground, that would mean I should be getting a positive connection to J7 in order to activate the electromagnet. Am I correct about that? If so, what is that image of G103? Is that body ground? And for the J7 positive connection, where does power come from? Full time positive? PCM positive? I pulled the fuse block apart and found the grey wire but not the dark green/white."

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2006 T&C all accessory 12v switched cigar jacks =dead, incl "Batt" always "on" one. Replaced all fuses, no change. Is there a common fusible link wired in?


The power jacks are designed to work only with the key on. With the key on, ground is supplied to the accessory relay. Pull out the relay and probe the socket with a test light ormeter to see if the ground signal is coming into the socket. If yes, make sure two of the other terminals are hot. If yes, push the relay bsck in to see if it clicks. If it does, the power supply wire from the relay is not getting to the jacks. If it doesn't click, pull it out and try swaping in another relay from the box. If it clicks, buy a new relay. If not, you must not be getting the the right signals to the socket.

0996b43f807ccd64-jnh1p0frnkt3q2fbcpfimq4v-5-1.gif



0996b43f807ccd65 (2)-jnh1p0frnkt3q2fbcpfimq4v-5-10.gif
Do It Yourself Diagnosis and Repair

Aug 11, 2017 | 2006 Chrysler Town & Country Touring

1 Answer

No fuel pressure, new pump


No fuel pressure means the pump is not running. Check the pump fuse and if it is good, find the pump relay and check for power going to it on the thick (red?) wire. If it has power there hook a meter or test light to the smaller power wire, have someone turn on the key while you watch the meter or light. It should read voltage for a few seconds.If that is good check the power wires going out from the relay to the pump. Same drill with the meter/light. If there is no power coming out from the relay it is a bad relay.

Oct 12, 2012 | 1996 Chevrolet S-10 Pickup

1 Answer

Replace fuel pump om 1990 nissa 300zx


Sort of.
There should be a relay that provides power to the pump when you first turn the key on.
Then once the engine starts power is provided by way of the oil pressure switch. That way the pump won't run in an accident.
The oil pressure switch grounds the fuel pump relay on some models.

Jul 21, 2012 | 1991 Nissan 300ZX

1 Answer

2003 sonoma, 4.3. ran fine, one morning tried to start, heard a pop" not in the motor" would turn over but not start, fuel pump made no sound in "on" postion or when starter was bumped....


There is nothing in the circuit after the relay, however, hearing the relay doesn't mean the power is available to run the pump, as the pump circuit is separate from the relay solenoid. The pump needs power from the 20 amp "ECM B" fuse. If you probe the relay socket with a test light, there should be 2 hot terminals--one from the PCM and one from the ECM B fuse. See diagram below.


If the power is there, are you sure it's the fuel pump relay that you hear clicking? If there are other relays in the box, it may be one of them that's coming on. Try swapping the pump relay with another one. Let me know if you get stuck or have more questions.

jturcotte_87.gif

Nov 07, 2010 | 2003 GMC Sonoma Extended Cab

1 Answer

I have1999 5.3 chevy pickup has no fuel pressure i checked pump it works with a battery i checked all fuses and relays


If the fuel pump is coming on,it does not mean it is pumping,if it is pumping when you test it,check power to the relay,and power from the relay,this would be the only reason for it not working unless there is a wire not making connection from the relay to the pump,or from the ecm to the relay,check to see if there is a short activation from the relay when turning the ignition switch on,then the relay will cut off on it`s own.

Aug 15, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Wwher is the fuel pump relay fuse located?


there are two fuse locations, under the dash by your left foot, and under the hood behind the passenger side headlight.

Your question is really NOT that easy to answer, there is no stock location for a "fuel pump relay" fuse, the fuel pump is powered by power coming from the MFI relay.

Fuse #1 under the hood supports the MFI relay as do fuses 1 and 12 under the dash. Check all three.

There are reasons a fuel pump won't start that are not related to the fuse... if you check them and determine that the fuses are not blown, with the ignition turned to the on position, try powering the fuel pump test jack, if your fuel pump comes on, it is something else (probably a bad cam/crank sensor)

To power the test jack, run a test wire from the positive terminal of the battery to the connector stuffed down behind the passenger side strut tower between the strut tower and the fire wall. It should be a black connector connected to a single black wire with a BLUE stripe. There will be three connectors bundled together, a black one, a blue one, and a round brown one (the round one is for setting timing and the blue is for setting idle, do NOT mess with them)

When you power the test connector, the fuel pump should come on, regardless of the MFI relay or the fuses... if it does not, you need a new fuel pump.

Cheers,
Scott
iceman_ii on www.3si.org

Feb 01, 2009 | 1992 Mitsubishi 3000GT

2 Answers

Not getting gas


with a fuel gauge, check for fuel pressure at fuel rail. make sure there is at least 35 psi. if no pressure, check for poewer/ ground at fuel pump plug. There should be power at the pink wire when key is turned to the on position. If there is power/ground, replce fuel pump. If no power, check fuses, pump relay and innertia switch(located in trunk). If pooped up, resset switch by pressing down on red bottom.

Aug 05, 2008 | 1999 Ford Taurus

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

25 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76673 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...